Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d361b6fa9b0df9…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 22:31:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 535175339f32621da5fc89706b570e05 SHA-1: 4e3342a3db5502d342a7395b35afd9f788379a8b SHA-256: a6d361b6fa9b0df9741814a2f08166989ac8c0adb750cb474bee7570a3399b93
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/coin-master-hack-online-no-human-verification-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/free-roblox-2021-unlimited-coins-for-kids_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-promo-codes-2021-december-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/without-human-verification-pubg-uc-hack_GM1330123889.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/hack-ticks-and-robux-no-scamn-idiiotr-rwetfr3eytegr-tgre-ee354_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-robux-2021-mac_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/pubg-uc-myanmar_GM1330123889.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-g4_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-free-rare-accounts_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-cheat-engine-hacks-64_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/all-free-roblox-catalog-items_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD4 22376 bytes
SHA-256: 44905b4d6bbd225e3db8195e0ca486dfac94b6904aca286b7912b61c8bbfdf65
font_01_sfnt_off0000619a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619A 18612 bytes
SHA-256: 338fae3f97a5e5398a6cf0b8c994910b70de825f0c392734b88d1d7319a72caa

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